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The Hornady 9th Edition devotes a section on loading the 357 Remington Maximum for the T/C Contender. Using the 180 grain HP XTP and or the 180 grain InterLock SP SSP.
Alliant 2400 17.1 gr. to 19.3 gr.
Lil' Gun 16.7 gr. to 21.6 gr.
WIN 296 17.1 gr. to 21.0 gr.
H110 17.3 gr. to 20.0 gr.
IMR 4227 17.5 gr. to 19.0 gr.
Viht N-120 19.4 gr. to 21.3 gr.
You will get your maximum velocity with Lil Gun and WIN 296 loads
Just as a channel check we are referring to the 357 Remington Maximum cartridge. Their test gun was a 10" barrel T/C. I have no idea what the best pet load for your gun might be. I haven't fired the cartridge or loaded it in years but remember being fond of my results with WIN 296 powder.
Ron
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